Yes you can mate . Just feed a pull through down the barrel pull out at magazine end ,spray some gun oil on 3 patches if .22 or 2 if .177, do this until the barrel is clean then do one with out oil .
The best thing to do is clean the barrel with a pull through ,then put about 40-50 pellets through to re lead it then zero in.
They come with factory grease in them .
What I have been reading in the last 6 months or so on the internet and talking to other shooters that the HW97KT is probably the best springer of all time .Do you agree with this and why ?
Have a look at this http://www.ebay.co.uk/itm/Red-Beam-Hunting-Lamp-Kit-Ideal-for-Air-Rifles-Rimfire-/200900544800?pt=UK_SportingGoods_Hunting_ShootingSports_ET&hash=item2ec69b0920
Had a HW 90 it was awful ,just would not group with any pellet took it back and had a refund .Talked to other people about them and got mixed review with them .